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Thank you for your reply.
I know the difference between timeframes; I’ve been trading for 25 years, 20 of them with the EUR/USD pair. I haven't been using your platform for long, though—it is very powerful, certainly, but nothing works easily or on the first try.
As I said, I tried every possible method before asking for help. After successfully loading intraday data going back to 2007 and daily data to 1980—which seems to be the maximum data available for the Euro/Dollar—and saving my workspace, the platform reverts to its default state upon reopening. All the loaded data disappears, and it goes back to the usual view:
I can only see the last 20 days of the chart, and the earliest day drops off as the latest day advances; today, the 25th, I only see back to the 5th; tomorrow, the 26th, I’ll only see back to the 6th.

How do I fix this? I want to apply the maximum available historical timeframe to any chart currently in my workspace or any I might open in the future.
Please explain it as if I were a 10-year-old. Thanks.

Also, as I mentioned in my previous message, when I finally managed to load the historical data onto some of my charts before it disappeared:

a) It didn't automatically load onto the other charts by default—I need this to happen automatically. In other words, if I’ve loaded a 6-day chart with data going back to 1980, I want to see data back to 1980 on my pre-configured 12-day chart as well, or on any other daily chart I might open later.
b) When I switched timeframes on a daily or intraday chart that *did* have historical data loaded—using the quick timeframe switcher on the control bar—the chart would "think" for a while before finally loading the historical view. That loading time isn't compatible with a feature designed for quick timeframe switching.

How do I resolve issues (a) and (b) so that all my charts work properly?

Many thanks.